Need your help.. I have purchased this turbo for a 1993 Mazda Rx7 years ago and would like to get the specs for it. I cant seem to find a maker because it was custom built from SPD Racing (SPECIALTY PRODUCTS DESIGN INC.) It has a 5 inch intake housing .96 A/R on the exhaust side and very little other markings. Any help would be great thanks.. See images. If I need to measure housings to get more information please let me know.

 

it reminds me of a gt35r, 60-1,T67 from its front(and there intake is around 4") but i look like t72(ported to T74 or a T4 T88 but someone correct me if im wrong

 

or a lesser version of this